Update docker/login-action action to v4

Author: renovate[bot]

.github/workflows/webapp-dev.yml

@@ -39,7 +39,7 @@ jobs:
       uses: docker/setup-buildx-action@v3
 
     - name: Login to the GitHub Container Registry
-      uses: docker/login-action@v3
+      uses: docker/login-action@v4
       with:
         registry: ghcr.io
         username: ${{ secrets.GHCR_USER }}